Ulmus americana 'New Harmony'

Ulmus americana 'New Harmony'
'New Harmony' growing in the Netherlands
SpeciesUlmus americana
Cultivar'New Harmony's4s
OriginMaryland Agricultural Research Service, US

The American elm cultivar Ulmus americana 'New Harmony' was raised by the Maryland Agricultural Research Service and released by the United States National Arboretum in 1995, along with 'Valley Forge'. 'New Harmony' proved the most successful U. americana cultivar in the US National Elm Trial, averaging a survival rate of 85.5% overall.[1]

Description

'New Harmony' is considered by some to have a more desirable form than 'Valley Forge' as it grows vertically on its own with a minimum of early training. The original parent tree (located on a roadside in Ohio) is already over 20 m high, with a slightly greater crown spread. The bole divides into several erect branches about 10 m above the ground terminating in slender, pendulous branchlets.[2]

Growth is rapid, young trees gaining in height by almost 1.7 m per annum in trials at U C Davis, although d.b.h. increase remained a modest 1.8 cm.[3]

Pests and diseases

Although resistant to Dutch elm disease and Elm Leaf Beetle Xanthogaleruca luteola, like most other American Elm cultivars 'New Harmony' is susceptible to Elm Yellows and Japanese Beetle Popillia japonica.[4] In the trials at U C Davis, the trees remained free of leaf curling aphids (Eriosoma), unlike its U. americana stablemates 'Valley Forge' and 'Princeton'.

Cultivation

'New Harmony' is currently being evaluated in the National Elm Trial [1] coordinated by Colorado State University. The tree was introduced to the UK in 2010.

Etymology

The tree is named for the Indiana town renowned for its social innovations in the 19th century.

Accessions

North America
Europe

References

  1. ^ Griffin, J.; et al. (2017). "Ten-Year Performance of the United States National Elm Trial" (PDF). Arboriculture & Urban Forestry. 43(3):107–120. International Society of Arboriculture, Atlanta, US.
  2. ^ Townsend, A. M., Bentz, S. E., and Douglass L. W. (2005). Evaluation of 19 American Elm Clones for Tolerance to Dutch Elm Disease Archived 2005-05-11 at the Wayback Machine. Journal of Environmental Horticulture, March 2005, Horticultural Research Institute, Washington, D.C.
  3. ^ McPherson, G. et al. (2008). National elm trial: Initial report from Northern California. Western Arborist, Fall 2009, 32–36.
  4. ^ Brady, C., Condra, J., & Potter, D. (2008) Resistance of Landscape-suitable Elm (Ulmus spp.) Cultivars to Japanese Beetle, Leaf Miners, and Gall Makers. 2008 Research Report, Nursery & Landscape Program, 15–16. University of Kentucky.
  5. ^ Netherlands Plant Collection: Iepen, Ulmus

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